<!-- 顶部导航 -->
<div class="top-nav">
    <div class="chat-tabs">
        <div class="chat-tab active" data-tab="chat">
            <i class="bi bi-chat-dots"></i>
            <span>对话</span>
        </div>
        <div class="chat-tab" data-tab="knowledge">
            <i class="bi bi-book"></i>
            <span>知识库</span>
        </div>
        <div class="chat-tab" data-tab="settings">
            <i class="bi bi-gear"></i>
            <span>设置</span>
        </div>
    </div>
    <div class="nav-actions">
        <!-- 导航操作按钮 -->
    </div>
</div> 